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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a9d8c7c3e6b05d11d69ba582ecab84c68cf9621ad9e9b2f0a27b8d1a5e51a8' 
  AND token = 'ZeNmCxa+DBlxM6j8t7giFXWodxzkt0oPzu8OKsI1h7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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