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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5602f5bed2293df91b893096de7f58f74c00f3876a82c513e3468ed298f1c873' 
  AND token = 'NakEa6M6iHN3h3ZOUhQndF6Kq46kZkmNoxEM/2KQw4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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