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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad71c896fc328a7e52c6d7770ac2cf7ce066fa1858584ad2ac9488620b1e6d45' 
  AND token = 'AwMMu/vg9UR3Mw6Rfj4F4gTaCjcwrO52SCNwYpF7TCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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