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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7540123e5da57ca93fafff3cb39c17e9bffc4993998589a5d58fe0bd66bef91b' 
  AND token = 'rkXThv8ZIskA2lR2evfbEjXIl9ZyL35fOs6f3B5Mc6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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