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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5e0b0a2d0981d525893a8b78ac35a225d40c167ce2f34a6ec4260211039302' 
  AND token = 'iQvFKqedleyA9vI8LYgPeO1h+gLFHjIwn50lXcgA6x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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