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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c84e4157d51fbdf384bee305da7e46dc6b0ebb263bfefb470d0544a407ae0' 
  AND token = 'ABwkWUm15Ux/Et55gZ3cXRlI2EuULfgyB6x5Orb8RKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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