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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb63930e3c927c032f13545e7f23c852fcb206fae2e4891b484a2cd12a7500de' 
  AND token = 'zV6IHBQuTpYI+6ubqiAM9p0cS2QH5XAkwrS//kMxvqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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