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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f98b907fd2a632d8db4eca8beb286a94f94c93eb57e067df108302f1805dac' 
  AND token = 'u36/JVvfQv2NrBbvKnkfLYyQdgqEBNuLdR1dC97suz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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