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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe914528a2913a91f540f0f2a2504b0be716dc870daa79acb630aa7219a2e19' 
  AND token = 'WFTCz5x/dONHBx6pJVNl6axcJtfQspgd3B8X2k+2SXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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