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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51032ab9ecf1f17b30789d431b1b582f25f5529033cb001232ac9f7bd1a7335a' 
  AND token = 'mm56LsAEdFwNeX1eBkYL2ByjtyTXQtI1E9lQ/EI6mFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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