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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0dde352472576d67c1609b8e3c4266c16c3719fa1f9b10d0531918a553564a' 
  AND token = 'MxO2bXwauwdh2OowOFt6txZ/cL/0vkGGL3sTGPFLcTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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