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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051e81e5fcde9a702ef16f693e7cebdf656877b4e55ac9ad05333c2ecc8a81b2' 
  AND token = '1AakEWTRdL/jwo2xesa7K/Djbgq7l55Ec7CbldwiLZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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