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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4b92d8730c82703bafce32e3fff0f95a5a0216216efd8d2a0fcccd7b9e7f3b' 
  AND token = '+6lpCEVvU6ILQKinreWtFewSbs4YPeaFosT5n5MRoB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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