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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e90433a3a2b591cdad0a28afc775d5c87a0f568d26515b7cff95b537e372ed4' 
  AND token = 'SFvqv76LRvg8PGODUjXLnEEEyOI2HOSDvh0L919yPaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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