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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9417ff1057e466c40f9a1c827bea75190a08ac10af70995eb63dbb1bc9efbc' 
  AND token = 'KNVkfWPTUkdfwZf9MgGF0JgmW6/BHq4LcMvovSo59GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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