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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2e142e5cd1a4224260a306c3bef950a88b7c2f4bd945e8e26f0f0be2eec0a6' 
  AND token = 'TyG8cxaGlUwSH6AXAAETKh3S7RCVd0cqvHgB7R9CBL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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