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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01acc786b1043d832b3020f9d2cc5d0d603fadad16058540ea3d72ed32154328' 
  AND token = '/RRdxwhnTnMXv3W0zzErusB+OVTJFtwH//4QMiSh0FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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