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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd785c8f16a221b9ee3fc4c2fba884a3ee625b0d1aa44d3d9e9d79fcf4853f8' 
  AND token = 's3BOzfoOj/ggejModbrsjnIu5Ib9B/wqGBlEzaOp/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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