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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1241658f5b255b91032b9a9072baccf034afc2dac3fd24c8c3a5b14a52ff9c3d' 
  AND token = 'MmDukDyDs9yiRtS8dfnqFB6Yq99OzYpENF2+tVy53Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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