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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f24cc93fea6ee0af82ad8701e3db77cdf6ae15f0f1cf40c81360a51db0217be' 
  AND token = 'uRayjuMYTHb6ECoTEDb9GwFApJepiV1AX62lSeG/oTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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