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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee59840e7b6ec493a395b3cb2f2d0d9bd7ec45623cecf566512202d09ffa3c6' 
  AND token = '5ZXBpjSAeAk6NzIp+6umatsxBKvLfgpEbdSSOJjCOCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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