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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b2755cbd442941234f8f3a7d25ae63b2e81083b4d490d78483527b7c3a4bf7' 
  AND token = 'f9gw1QfwbBdROkBWNe5eq8+IzF6qdg1PFAoqkIHjp44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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