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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dc8d2e885d54cba4a6bce8248c2e28a28f194330b7fa5ad0273bb63fa524dd' 
  AND token = 'nAK6RtCLQi4+bnNwoVIS6SsFagyWluysn43G4OFOQlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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