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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b70f5cd0852879ed56fd6ad1746b1ba0581e3b262d45bc813ae1a9b792caeb2' 
  AND token = '6c89l8oCWRSxKOWuRoL8+4rIxE0ORhkg2CmXT6PLNM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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