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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cbaf6798e8ff6ac0b68404055d7db5956ab75e4852a09c20b9cf38c08f48bd' 
  AND token = '8FhxfTdNeu2cwa8ez2fQk1oKUXX0Quf/w7heqySLAj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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