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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5a31c06937cb9ca9144a39a192181a293651419d7e260e4779243f8fcc991c' 
  AND token = 'LwMGHqzSSkLbLcb4Sr/6eGvxiRLCnfhZpPupIU0hedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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