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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e68896b083400bdcd9fe2310f2addceec48c8445fc1eef538984ca1190cb7e' 
  AND token = 'rZiU34mCooWG+JjH6+ubZ+mFX/OLxJ2YrHKgy38HPYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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