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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82c5102bae6442a764b34171284c77bfd6df7cd7097c1c8b8e9f559a06b49c8' 
  AND token = 'DyhjLskcEEiz+9LJ368Xy86YCYXa8yJIMbrY8ARYis4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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