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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6c765dc8e98bd875ac392e058751731a16d89178828c4c6c1e62af9a27f92' 
  AND token = 'StvDX53kbRB62Hv60aakjqRjYDoW9NGjHSiyyl5TNsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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