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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72556630da431efc0eef41786ef238d7bfe697f38df3a3e860b62ef944eecf8' 
  AND token = '+u32/WKFvDOYkvxkmuYsp6oXa7ZSKVydtl15uK0x+rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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