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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf4c98cdd1b64611829b97c72e2711da1f5cc81dd816291b39d168c70c9f712' 
  AND token = 'J7swAyJSGofJabBCOISiXsWXUu62H0agoN4uLp4HtGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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