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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0a891a6507f4956e47f5be46878077199882686e94936f8ea85ea8bbc4f13a' 
  AND token = 'AMjk2Yr8Hrmv0MEGl14tkgtbfnevZC0Mt7ROODgoA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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