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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c77e4844ce00db1da0e93a512c13dc72f9256a887feeffb5afdb80cd140422' 
  AND token = 'TUkdXgrcgdZpgFJam6mCSxtNx07gJwb8QRtXL0pte6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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