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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2858a5a6e11f201cc4388d11afaa9c619cd28efe8363ab908d1b48563d8f4bff' 
  AND token = 'UfGvCLSxXrLRF7gjgkSbWPxpAoJSpFWwb5BJ5UgNDX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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