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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec1a528953d83763b0f846a247a1d772a7e6fe0be42e7be9d75465d92404088' 
  AND token = 'gPxy6M3xPrOQ+V6dp/NM7+T05NBj+krscQTV4yKpCZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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