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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e943aa77fd26cb08d11dbd30b4a76a1b02eff28467fe6949d08848c2b49f87' 
  AND token = 'fNsKlg3nxvutXVaODgsD6HCG4vI5qnVIIMDBS/FetEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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