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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394d3cd1f2e52c775ca24e3dce5046e79aaff13b65a4bd08b952a810f417353d' 
  AND token = 'ytXNGkR77pNcKlGnijmX+Os4y5KuZpNBsBSqOKdAbHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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