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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a7cf152ab37f0348394ec091ae122aaa73163a963bd8ee0443e8b13d192b3e' 
  AND token = 'RfCp6AFYeQnvnfozVEdLj0Qss95XRj1ezEgY15VzrHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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