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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be615f0ac9700c0f50ea9c0680e0ab1693c01586bb27cc643edad32f391c700f' 
  AND token = 'VILGnwfCcnAIlS/8yCiFhI5gSGtPykXUzgcyP/uiqR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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