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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4b6c81fe87b2f3300a77c94fcc84ffbc7d2092c8799adb142e6bc38230697a' 
  AND token = 'RryJY0zTxvqHaxp1/U1ZZdasJPTsDlr3RIkmiq6GByc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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