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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02ab67f45c9cb1f4a2f36ddb624eaa323bd801cff888c0830911bc14362bb08' 
  AND token = 'PHXiAOzsO5cMZcc+IrbkVW0CY4CTLf6AzkLXS/BTMMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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