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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9befeaf5f91162e94c2d2a8a72ec909e5c81c96679b3deb248050df3f4867bcf' 
  AND token = 'Z4MeH4B43iInlH9e47/yS+fUTLORTwYkdmohDxRx2u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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