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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc14f381413586cdf5e25422e1df3e1e51e2390224a8b359d3b206436213937' 
  AND token = 'rG5tE8c+ftQ++toML5MiiIC1vdvbmCifAjxKeX1PfAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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