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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81a99528acf0428f18e9c3420a30134f877548e42ef26a94cc9605ff7572569' 
  AND token = '+54Nz7GyEzITQEAbI8Fod2ETYjsdSkGbydjnaev6ieo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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