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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee12fd3e0f27452bd9b0199748eb7df3a3be3c7e605cdd0ee8e1e16efaffbbfe' 
  AND token = 'W5UoAURNu4M8bHTS3RQ74H4VhvYB5xEwYd99XfWz+6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}