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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e57d8ca3207724fef71afa0f4e65b3839a72d88a57c39d2245c9c180c30f935' 
  AND token = 'bRp2cq5f0g6ZgIstnltG9yVb4trFF1mBKTQ92J1/3ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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