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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1754a70f6150b2257718ef6c2fa4c6f4aa85324b9ba77b51a998391ea2d9bd2d' 
  AND token = 'nuctnV4Tn6yjy36NdR++6PdE8Gy4MUQfPRRnjerv2lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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