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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fbb50159728455750340124cb97c0e0ac6bf6c47baba34fc422f776df594ba' 
  AND token = 'do3dRZ3blLW5nNmWMQhVse+fMDVUjC3lta71r2rOX8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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