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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc022f155630198db4d5ea5a93637049e7239070b91897367d7cb7c00f3d8ca0' 
  AND token = 'pyXopyNQlwH5n3sTGUcSSjQCQQgV7LMHJVFwS55Oxts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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