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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fbd0f51753921c9a36d8d0deecb4545b2c772d6e4ab0ec18d5bf56ce22eba8' 
  AND token = 'sMeMx1UCR3k6evTebSgB40nBcVdJRA/mqIG4+ixNS8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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