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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19eaee12bd48fcbf3bc3539e2a9a5344e51081c94dfe1056e3e86ea137965e0c' 
  AND token = 'Ahni3ZeRGCPLW+P3t0F/ySQ2HPZiGJic5kcaHMWX/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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