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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609eba7e9bde3131dad63be7b5a8dfad65de28b9f22b6115b5e87972b344188a' 
  AND token = 'wWvEiJQONMNbbW7TB9QfPqv/fC5NHG5SlaQJZC0gB+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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