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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f538a0c56a4f86fb00a39939160438457e09cf4be6220799fccdeaf069d3f5c' 
  AND token = 'OLD2VVBl4W4XjN6mGYxr76RMTmwOlo1+E22yOjGeI/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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